deploy dash on IIS error

[lx1054331851]

my flask demo app works fine on IIS, the demo code is :

so I replace the flask demo code with dash demo code copied from dash official website, it looks like :

there, the dash app on IIS went wrong, the error information is :

the dash demo code works fine in the debug environment with the command:
python.exe hello.py

my environment is Anaconda 3, Python 3.6 x64.

I'm not sure where is the problem?
should I need to do more configuration on IIS after I replace the flask code with dash code?
My flask app name is hello.py, I just replace the hello.py file's content.

[chriddyp]

Solved in https://community.plot.ly/t/solved-deploy-dash-on-iis-error/5434